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TY - CONF AU - Guiducci, S. AU - Alesini, D. AU - Biagini, M.E. AU - Bilanishvili, S. AU - Blanco-García, O.R. AU - Boscolo, M. AU - Buonomo, B. AU - Cantarella, S. AU - Di Giulio, D.G.C. AU - Foggetta, L.G. AU - Gallo, A. AU - Ghigo, A. AU - Kankadze, L. AU - Milardi, C. AU - Ricci, R. AU - Rotundo, U. AU - Sabbatini, L. AU - Serio, M. AU - Stella, A. AU - Valente, P. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Proposal for Using DAΦNE as Pulse Stretcher for the Linac Positron Beam J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The PADME experiment* proposes a search for the dark photon (A') in the e⁺e⁻ -> gamma A' process in a positron-on-target experiment, exploiting the positron beam of the DAΦNE linac at the Frascati National Laboratory. The linac could provide a number of positrons as high as 10⁹/pulse in a 200 ns pulse but the number of positrons for PADME is limited below 10⁵/pulse in order to keep the pile-up probability in the calorimeter low enough. The PADME experiment is indeed limited by the low duty factor (10e-5=200ns/20ms). An alternative proposal to use the DAΦNE positron ring as a linac pulse stretcher, by injecting each pulse into the ring and extracting it by a slow resonant extraction using the m/3 resonance, is described in this paper. This allows to distribute the positrons of a linac pulse in a much longer pulse (0.2 - 0.5 ms) increasing the duty factor up to ~ 2%. The required modifications of the DAΦNE positron transfer line and main ring are presented. A dedicate lattice for the ring has been designed and tracking of the positrons in the ring has been performed to optimize extraction parameters and give a preliminary estimate of the extracted beam characteristics. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3258 EP - 3261 KW - extraction KW - septum KW - linac KW - positron KW - pulse-stretcher DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAK023 UR - http://jacow.org/ipac2018/papers/thpak023.pdf ER -